Safety helmet



FIG. 1 is a front side perspective view showing my new design for safety helmet;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a rear side perspective view thereof.

The broken lines illustrate portions of the safety helmet and form no part of the claimed design. 

CLAIM The ornamental design for safety helmet, as shown and described. 